package com.dailywork.java8;

import java.util.Arrays;
import java.util.List;
import java.util.function.Supplier;
import java.util.stream.Stream;

/**
 * Testing the order of execution.
 *
 * @author Benjamin Winterberg
 */
public class Streams5 {

    public static void main(String[] args) {
        List<String> strings = Arrays.asList("d2", "a2", "b1", "b3", "c");

        //        test1(strings);
        //        test2(strings);
        //        test3(strings);
        //        test4(strings);
        //        test5(strings);
        //        test6(strings);
        //        test7(strings);
        test8(strings);
    }

    private static void test8(List<String> stringCollection) {
        Supplier<Stream<String>> streamSupplier =
                () -> stringCollection.stream().filter(s -> s.startsWith("a"));

        streamSupplier.get().anyMatch(s -> true);
        streamSupplier.get().noneMatch(s -> true);
    }

    // stream has already been operated upon or closed
    private static void test7(List<String> stringCollection) {
        Stream<String> stream = stringCollection.stream().filter(s -> s.startsWith("a"));

        stream.anyMatch(s -> true);
        stream.noneMatch(s -> true);
    }

    // short-circuit
    private static void test6(List<String> stringCollection) {
        stringCollection.stream()
                .map(
                        s -> {
                            System.out.println("map:      " + s);
                            return s.toUpperCase();
                        })
                .anyMatch(
                        s -> {
                            System.out.println("anyMatch: " + s);
                            return s.startsWith("A");
                        });
    }

    private static void test5(List<String> stringCollection) {
        stringCollection.stream()
                .filter(
                        s -> {
                            System.out.println("filter:  " + s);
                            return s.toLowerCase().startsWith("a");
                        })
                .sorted(
                        (s1, s2) -> {
                            System.out.printf("sort:    %s; %s\n", s1, s2);
                            return s1.compareTo(s2);
                        })
                .map(
                        s -> {
                            System.out.println("map:     " + s);
                            return s.toUpperCase();
                        })
                .forEach(s -> System.out.println("forEach: " + s));
    }

    // sorted = horizontal
    private static void test4(List<String> stringCollection) {
        stringCollection.stream()
                .sorted(
                        (s1, s2) -> {
                            System.out.printf("sort:    %s; %s\n", s1, s2);
                            return s1.compareTo(s2);
                        })
                .filter(
                        s -> {
                            System.out.println("filter:  " + s);
                            return s.toLowerCase().startsWith("a");
                        })
                .map(
                        s -> {
                            System.out.println("map:     " + s);
                            return s.toUpperCase();
                        })
                .forEach(s -> System.out.println("forEach: " + s));
    }

    private static void test3(List<String> stringCollection) {
        stringCollection.stream()
                .filter(
                        s -> {
                            System.out.println("filter:  " + s);
                            return s.startsWith("a");
                        })
                .map(
                        s -> {
                            System.out.println("map:     " + s);
                            return s.toUpperCase();
                        })
                .forEach(s -> System.out.println("forEach: " + s));
    }

    private static void test2(List<String> stringCollection) {
        stringCollection.stream()
                .map(
                        s -> {
                            System.out.println("map:     " + s);
                            return s.toUpperCase();
                        })
                .filter(
                        s -> {
                            System.out.println("filter:  " + s);
                            return s.startsWith("A");
                        })
                .forEach(s -> System.out.println("forEach: " + s));
    }

    private static void test1(List<String> stringCollection) {
        stringCollection.stream()
                .filter(
                        s -> {
                            System.out.println("filter:  " + s);
                            return true;
                        })
                .forEach(s -> System.out.println("forEach: " + s));
    }
}
